JPS5933529Y2 - Throwaway tip - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a negative type indexable insert, which has particularly good chip control and can be applied to a wide range of cutting areas.

Conventionally, this type of indexable insert has chip breaker grooves to dispose of chips, but there is generally a limit to the range of chip disposal, and there have been many problems, especially in the area of light cutting.

Therefore, there is a demand for the development of an indexable insert that can perform good chip disposal even in the area of light cutting.

The present invention has been developed in view of the above-mentioned points, and a step surface is formed in the corner forming the nose portion of the indexable tip to remove the chip breaker groove. On the central land side of the part, small protrusions located at a position somewhat lower than the chip breaker groove are successively arranged in a spaced manner to improve chip disposal in light cutting areas.

Hereinafter, one embodiment of the indexable chip of the present invention will be described with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a triangular plate-shaped indexable tip, which is of a so-called negative type.

A chip breaker groove 5 is formed along the cutting edge 4 on the upper and lower surfaces 2 and 3 constituting the rake surface of the indexable insert 1, and a central land portion 6 remains.

In addition, at the corner of the nose 7, a small protrusion 8 having a band shape is formed by removing a part of the chip breaker groove 5.
A stepped surface 9 is defined.

In this case, the small protrusion 8 is connected to the chip breaker groove 5 so as to be located at a position slightly lower than this.
The cutting edge 4 is also spaced apart, thereby improving chip disposal in light cutting areas.

Although the chip breaker groove 5 is shown without an intermediate land, it is possible to modify the chip breaker groove 5 so that it has this land or has a width that widens towards the end.

This is because the chip breaker groove 5 that matches the cutting conditions should be selected in the normal medium-9-heavy cutting area.

As a result of conducting various cutting tests using the indexable insert 1 constructed in this way, it was confirmed that good chip disposal was possible in a range from light cutting to heavy cutting, and its effectiveness was confirmed.

As explained above, the present invention forms a stepped surface with small protrusions on the nose of the indexable insert by removing a part of the chip breaker groove, thereby reducing the amount of chips in the light cutting area. Since the cutting process is improved, the range of chip processing is expanded and effective cutting work can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the indexable chip of the present invention, FIG. 2 is an enlarged sectional view of the main part taken along the line ■-■ in FIG. 1, and FIG. , is an enlarged cross-sectional view of the main part taken along the line ■-■ in FIG. 1; 1... Throwaway tip, 2...
Top surface, 3...Bottom surface, 5...Chip breaker groove, 6...Central land part, 7...Nose part, 8... Small protrusion, 9... step surface.

Claims (1)

[Claims for Utility Model Registration] A negative type indexable plate consisting of a polygonal plate such as triangular, square, or rhombic, with chip breaker grooves 5 formed on the upper and lower surfaces 2 and 3 of the plate with respect to the cutting edge 4. In the chip, a stepped surface 9 from which the chip breaker groove 5 is removed is formed at a corner constituting the nose portion 7 of the indexable chip 1, and this stepped surface 9
A throw-away tip characterized in that small protrusions 8 located at a position somewhat lower than the chip breaker groove 5 are successively arranged at a distance on the central land portion 6 side of the tip.